AAppendix185Glossary of Terms10BaseT The IEEE 802.3 specification for 10 Mbps Ethernet over two pairs of Cat3 or better UTP (unshielded twisted‐pair) cable, up to 200 m.100BaseT A set of media specifications, which include 100Base‐TX, 100Base‐T4and 100Base‐FX. Also known as Fast Ethernet.1000BaseT The IEEE 802.3 specification for Gigabit Ethernet over four pairs of Cat5E or better UTP cable, up to 100 m length.3DES Triple‐DES and Triple Data Encryption Algorithm or TDEA.ABR Area Border Router.ACL Access Control List.ActiveX An ActiveX object is HTTP component, which is downloaded andexecuted on the client computer.AES Advanced Encryption Standard. A 128 block size with key lengths of 128‐256 bits.ALG Application Layer Gateway.ARP Address Resolution Protocol. A protocol for mapping an IP address to aphysical machine address e.g. MAC‐addresses.AS Autonomous System.ASBRs Autonomous System Boundary Routers.BDR Backup Designated Router.Blowfish (40‐448 bits) A 64‐bit block cipher with key length variable between 32 and 448 bits.BOOTP Bootstrap Protocol.Brute Force Attack For symmetric‐key ciphers, a brute force attack typically means a brute‐force search of the key space; that is, testing all possible keys in order torecover the plaintext used to produce a particular cipher text.CA Certificate authority. An authority in a network that issues and managessecurity credentials and public keys for message encryption.CAST‐128 A 64‐bit block cipher with a 128‐bit key.